Modelling of the hydrogen distribution at a crack tip

Turnbull, A.; Ferriss, D. H.; Anzai, Hideya

doi:10.1016/0921-5093(95)09897-6

Cited by 58 publications

(48 citation statements)

References 9 publications

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“…The electrochemical principles that govern C L vs E App are well established, [10,31,42,67,68] and idealizedquantitative model approaches were developed. [18,32,69] However, it is not yet possible to accurately predict absolute values of C L vs E App . The trends in K TH Ã and da/dt II vs E App are explained based on a maximum overpotential for crack-tip H production (g) specific to two regimes.…”

Section: Effect Of Applied Potentialmentioning

confidence: 99%

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Measurement and Modeling of Hydrogen Environment–Assisted Cracking of Ultra-High-Strength Steel

Lee

Gangloff

2007

Metall Mater Trans A

102

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Modern precipitation-hardened ultra-high-strength AERMET 100 steel (Fe-Co-Ni-Cr-Mo-C) is susceptible to severe transgranular hydrogen environment-assisted cracking (HEAC) in neutral 3.5 pct NaCl solution. The threshold stress intensity for HEAC, K TH , is reduced to as low as 10 pct of K IC , and the stage II subcritical crack growth rate, da/dt II , is up to 0.5 lm/s. Low K TH and high da/dt II are produced at potentials substantially cathodic, as well as mildly anodic, to free corrosion. However, a range exists at slightly cathodic potentials (-0.625 to -0.700 V SCE ), where the crack growth rate is greatly reduced, consistent with reduced crack-tip acidification and low cathodic overpotential for limited H uptake. Short crack size (250 to 1000 lm) does not promote unexpectedly severe HEAC. High-purity AERMET 100 is susceptible to HEAC because martensite boundary trapping and high crack-tip stresses strongly enhance H segregation to sites that form a transgranular crack path. The stage II da/dt is H diffusion rate limited for all potentials examined. A semiquantitative model predicts the applied potential dependence of da/ dt II using reasonable input parameters, particularly crack-tip H uptake reverse calculated from measured K TH and a realistic critical distance. Modeling challenges remain.

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Section: Effect Of Applied Potentialmentioning

confidence: 99%

“…If C S reaches equilibrium quickly for a given g, then H diffusion controls da/dt II . [69] A range of onedimensional models for diffusion-limited da/dt II have been solved for a variety of boundary conditions and are of the form [11] …”

Section: E Heac Propagation Kineticsmentioning

confidence: 99%

Measurement and Modeling of Hydrogen Environment–Assisted Cracking of Ultra-High-Strength Steel

Lee

Gangloff

2007

Metall Mater Trans A

102

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“…The susceptibility of a material to embrittlement is determined by the hydrogen concentration near the metal surface, which is governed by the rates of absorption and diffusion [3,4]. Studies of absorption kinetics are facilitated by in situ detection of hydrogen near metal surfaces under electrochemical polarization.…”

Section: Introductionmentioning

confidence: 99%

Stress in aluminum induced by hydrogen absorption during cathodic polarization

2015

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“…An alternative approach is to assume that hydrogen absorption can be described via appropriate boundary conditions (e.g., Sofronis and McMeeking, 1989). In principle, these boundary conditions may be related to transport in the crack environment and reactions at the crack surfaces (Turnbull et al, 1996;Turnbull, 2001), but this connection is not well established at present.…”

Section: Introductionmentioning

confidence: 99%